Nice.Not unknown, but way less well known by younger generations: Django Reinhardt
[EDIT] Excuse the poor title. I'm just sharing videos of a guitarist that I think are truly amazing.
Mariusz Goli. Check out his videos. My current favorite...
His most popular vid
Nice, Dorje is a good band.Rabea from Dorje, the guy is sick.
Gary Moore(feels strange saying he's unknown, but I doubt most people know him), Mats Haugen, Paul Gilbert, Johan Reinholdz, Thomas Youngblood, Mark Morton, Willie Adler, Greg Howe, Gus G, Rob Chapman, Travis Burke, Paul Masvidal, Rusty Cooley, Tosin Abasi, Al Di Meola, Muhammed Suicmez, Jeff Loomis, Michael Ammot, Mikael Akerfelt, Luke Hoskin, Criss Oliva, Jari Maenpaa.
These are all my favorites.
Appreciated Paul Gilbert's work for a while.